Science Class 7

Earth, Moon, and the Sun 1. In Fig. 12.17, how many hours of sunlight do the North Pole and the South Pole receive during one rotation of the Earth? Answer: In Fig. 12.17, the North Pole receives 24 hours of sunlight during one rotation of the Earth in June, as it is continuously in sunlight. […]

Light: Shadows and Reflections 1. Which of the following are luminous objects? Mars, Moon, Pole Star, Sun, Venus, Mirror Answer:  The luminous objects are the Sun and the Pole Star. Mars, Moon, Venus, and Mirror are non-luminous objects because they do not emit their own light; they reflect light from other sources. 2.Match the items […]

Life Processes in Plants 1. Complete the following table S.No. Feature Photosynthesis Respiration 1. Raw materials Carbon dioxide, Water Glucose, Oxygen 2. Products Glucose, Oxygen Carbon dioxide, Water, Energy 3. Word equation Carbon dioxide + Water → Glucose + Oxygen (in the presence of sunlight and chlorophyll) Glucose + Oxygen → Carbon dioxide + Water […]

Life Processes in Animals 1. Complete the journey of food through the alimentary canal by filling up the boxes with appropriate parts- Food → Mouth → ______ → Stomach → ______ → ______ → Anus Answer: Food → Mouth → Oesophagus → Stomach → Small Intestine → Large Intestine → Anus 2. Sahil placed some […]

Measurement of Time and Motion 1. Calculate the speed of a car that travels 150 metres in 10 seconds. Express your answer in km/h. Answer Speed = Distance / Time = 150 m / 10 s = 15 m/s To convert to km/h: 15 m/s × (3600/1000) = 15 × 3.6 = 54 km/h 54 […]

Heat Transfer in Nature 1. Choose the correct option in each case. (i) Your father bought a saucepan made of two different materials, A and B, as shown in Fig. 7.14. The materials A and B have the following properties – Answer: (c) A is a good conductor and B is a poor conductor of […]

Adolescence: A Stage of Growth and Change 1. Ramesh, an 11-year-old boy, developed a few pimples on his face. His mother told him that this is because of ongoing biological changes in his body. (i) What could be the possible reasons for the development of these pimples on his face? Pimples are caused by acne, […]

Changes Around Us: Physical and Chemical 1. Which of the following statements are the characteristics of a physical change? (i) The state of the substance may or may not change. (ii) A substance with different properties is formed. (iii) No new substance is formed. (iv) The substance undergoes a chemical reaction. (a) (i) and (ii)  […]

The World of Metals and Non-metals 1. Which metal is commonly used to make food packaging materials as it is cheaper, and its thin sheets can be folded easily into any shape? Answer: (i) Aluminium Explanation: Aluminium is used for food packaging because it is cheap, lightweight, and can be easily shaped into thin, flexible […]

Electricity: Circuits and their Components 1. Choose the incorrect statement. (i) A switch is the source of electric current in a circuit. (ii) A switch helps to complete or break the circuit. (iii) A switch helps us to use electricity as per our requirement. (iv) When the switch is in ‘OFF’ position, there is an […]